Subtract 12/54 from 24/21, Solve 1 3/21

Subtract 12/54 from 24/21

1^st number: 1 3/21, 2^nd number: 12/54

24/21 - 12/54 is 58/63.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 21 × 18 = 378,
24/21 = 24 × 18/21 × 18 = 432/378
Likewise, for the 2nd fraction, since 54 × 7 = 378,
12/54 = 12 × 7/54 × 7 = 84/378
Subtract the two like fractions:
432/378 - 84/378 = 432 - 84/378 = 348/378
After reducing the fraction, the answer is 58/63

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